<?php
/**
 * Created by Alan.
 * User: Alan
 * Date: 2018\8\21 0021
 * Time: 16:21
 */

namespace app\api\service;


use app\api\model\OrderProduct;
use app\api\model\Product;
use app\api\model\UserAddress;
use app\lib\enum\OrderStatusEnum;
use app\lib\exception\OrderException;
use app\lib\exception\UserException;
use \app\api\model\Order as OrderModel;
use think\Db;

class Order
{
    // 订单的商品列表，也就是客户端传递过来的products参数
    protected $oProducts;

    //真实的商品列表 （包括库存量）
    protected $products;

    protected $uid;

    public function place($uid, $oProducts)
    {
        //oProducts和products 进行对比
        //products 从数据表中查出来
        $this->oProducts = $oProducts;
        $this->products = $this->getProductsByOrder($oProducts);
        $this->uid = $uid;
        $status = $this->getOrderStatus();
        if(!$status['pass']){
            $status['order_id'] = -1;
            return $status;
        }
        //开始创建订单
        $orderSnap = $this->snapOrder($status);
        $order = $this->createOrder($orderSnap);
        $order['pass'] = true;
        return $order;
    }

    private function createOrder($snap)
    {
        Db::startTrans();
        try{
            $orderNo = $this->makeOrderNo();
            $order = new OrderModel();
            $order->user_id = $this->uid;
            $order->order_no = $orderNo;
            $order->total_price = $snap['orderPrice'];
            $order->total_count = $snap['totalCount'];
            $order->snap_img = $snap['snapImg'];
            $order->snap_name = $snap['snapName'];
            $order->snap_address = $snap['snapAddress'];
            $order->snap_items = json_encode($snap['pStatus']);
            $order->save();

            $orderID = $order->id;
            $create_time = $order->create_time;

            foreach($this->oProducts as &$p){
                $p['order_id'] = $orderID;
            }
            $orderProduct = new OrderProduct();
            $orderProduct->saveAll($this->oProducts);
            Db::commit();
            return [
                'order_no' => $orderNo,
                'order_id' => $orderID,
                'create_time' => $create_time
            ];
        }catch (\Exception $ex){
            Db::rollback();
             throw $ex;
        }


    }

    public static function makeOrderNo()
    {
        $yCode = array('A','B','C','D','E','F','G','H','I','J');
        $orderSn = $yCode[intval(date('Y')) - 2017] .strtoupper(dechex(date('m'))) .date('d') .substr(time(), -5) .substr(microtime(), 2, 5) .sprintf('%02d', rand(0, 99));
        return $orderSn;
    }

    //生成订单快照
    private function snapOrder($status)
    {
        $snap = [
            'orderPrice' => 0,
            'totalCount' => 0,
            'pStatus' => [],
            'snapAddress' => null,
            'snapName' => '',
            'snapImg' => ''
        ];

        $snap['orderPrice'] = $status['orderPrice'];
        $snap['totalCount'] = $status['totalCount'];
        $snap['pStatus'] = $status['pStatusArray'];
        $snap['snapAddress'] = json_encode($this->getUserAddress());
        $snap['snapName'] = $this->products[0]['name'];
        $snap['snapImg'] = $this->products[0]['main_img_url'];

        if(count($this->products) > 1){
            $snap['snapName'] .= '等';
        }
        return $snap;
    }

    private function getUserAddress()
    {
        $userAddress = UserAddress::where('user_id','=',$this->uid)
            ->find();
        if(!$userAddress){
            throw new UserException([
                'msg' => '用户下单地址不存在，下单失败',
                'errorCode' => 60001
            ]);
        }
        return $userAddress->toArray();
    }

    public function checkOrderStock($orderID)
    {
        $oProducts = OrderProduct::where('order_id','=',$orderID)
            ->select();
        $this->oProducts = $oProducts;
        $this->products = $this->getProductsByOrder($oProducts);
        $status = $this->getOrderStatus();
        return $status;
    }

    private function getOrderStatus()
    {
        $status = [
            'pass' => true,
            'orderPrice' => 0,
            'totalCount' => 0,
            'pStatusArray' => []
        ];

        foreach($this->oProducts as $oProduct)
        {
            $pStatus = $this->getProductStatus(
                $oProduct['product_id'],$oProduct['count'],$this->products
            );
            if(!$pStatus['haveStock']){
                $status['pass'] = false;
            }
            $status['orderPrice'] += $pStatus['totalPrice'];
            $status['totalCount'] += $pStatus['counts'];
            array_push($status['pStatusArray'], $pStatus);
        }
        return $status;
    }

    private function getProductStatus($oPID, $ocount, $products)
    {
        $pIndex = -1;
        $pStatus = [
            'id' => null,
            'haveStock' => false,
            'counts' => 0,
            'price' => 0,
            'name' => '',
            'totalPrice' => 0,
            'main_img_url' => null
        ];

        for($i=0;$i<count($products);$i++){
            if($oPID == $products[$i]['id']){
                $pIndex = $i;
            }
        }

        if($pIndex == -1){
            //客户端传递的product_id有可能根本不存在
            throw new OrderException([
                'msg' => 'id为'.$oPID.'的商品不存在，创建订单失败'
            ]);
        }
        else {
            $product = $products[$pIndex];
            $pStatus['id'] = $product['id'];
            $pStatus['name'] = $product['name'];
            $pStatus['counts'] = $ocount;
            $pStatus['price'] = $product['price'];
            $pStatus['main_img_url'] = $product['main_img_url'];
            $pStatus['totalPrice'] = $product['price'] * $ocount;

            if($product['stock'] - $ocount >=0){
                $pStatus['haveStock'] = true;
            }
        }
        return $pStatus;

    }

    //根据订单信息查找真实的商品信息
    private function getProductsByOrder($oProducts)
    {
        $oPIDs = [];
        foreach($oProducts as $item){
            array_push($oPIDs, $item['product_id']);
        }
        $products = Product::all($oPIDs)
            ->visible(['id', 'price', 'stock', 'name', 'main_img_url'])
            ->toArray();
        return $products;
    }

    public function delivery($orderID, $jumpPage = '')
    {
        $order = OrderModel::where('id','=',$orderID)
            ->find();
        if(!$order){
            throw new OrderException();
        }

        if($order->status != OrderStatusEnum::PAID){
            throw new OrderException([
                'msg' => '还没付款呢，想干嘛？或者你已经更新过订单了，不要在刷了',
                'errorCode' => 80002,
                'code' => 403
            ]);
        }
        $order->status = OrderStatusEnum::DELIVERED;
        $order->save();

        $message = new DeliveryMessage();
        return $message->sendDeliveryMessage($order, $jumpPage);
    }
}